proc: introduce proc_create_net_single

Variant of proc_create_data that directly take a seq_file show
callback and deals with network namespaces in ->open and ->release.
All callers of proc_create + single_open_net converted over, and
single_{open,release}_net are removed entirely.

Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 2 insertions, 14 deletions

diff --git a/net/kcm/kcmproc.c b/net/kcm/kcmproc.c
index 6283ed2f43b2..370da2f80e3c 100644
--- a/net/kcm/kcmproc.c
+++ b/net/kcm/kcmproc.c
@@ -345,22 +345,10 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
         return 0;
 }
 
-static int kcm_stats_seq_open(struct inode *inode, struct file *file)
-{
-        return single_open_net(inode, file, kcm_stats_seq_show);
-}
-
-static const struct file_operations kcm_stats_seq_fops = {
-        .open    = kcm_stats_seq_open,
-        .read    = seq_read,
-        .llseek  = seq_lseek,
-        .release = single_release_net,
-};
-
 static int kcm_proc_init_net(struct net *net)
 {
-        if (!proc_create("kcm_stats", 0444, net->proc_net,
-                         &kcm_stats_seq_fops))
+        if (!proc_create_net_single("kcm_stats", 0444, net->proc_net,
+                         kcm_stats_seq_show, NULL))
                 goto out_kcm_stats;
 
         if (!proc_create_net("kcm", 0444, net->proc_net, &kcm_seq_ops,